When a 40-n force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30 above the horizontal, the acceleration of the crate is 2.0 m/s2 , up the incline. the mass of the crate is: ?

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

How do we measure or think of speed in the united states?

If forces acting on an object are unbalanced. true or false